import java.util.*;
 public class Example3_9{
	public static void main (String arg[]){
	  Scanner reader = new Scanner (System.in);
	  double sum=0;
	  int m=0;
	  while (reader.hasNextDouble()){
		double x=reader.nextDouble();
	  	m=m+1;
	 	sum=sum+x;
	  }
	System.out.printf("%d个数的和为%f\n",m,sum);
	System.out.printf("%d个数的平均值是%f\n",m,sum/m);
	}
}
